US4346850A - Shredding machine incorporating a torque cushioning assembly - Google Patents
Shredding machine incorporating a torque cushioning assembly Download PDFInfo
- Publication number
- US4346850A US4346850A US06/179,068 US17906880A US4346850A US 4346850 A US4346850 A US 4346850A US 17906880 A US17906880 A US 17906880A US 4346850 A US4346850 A US 4346850A
- Authority
- US
- United States
- Prior art keywords
- comminuting
- shaft
- casing
- drive
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/24—Drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C2018/164—Prevention of jamming and/or overload
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19633—Yieldability in gear trains
Definitions
- the coupling between the drive motor and input shaft of the transmission assembly is a resilient belt and pulley drive in which the relationship of the parallel axes of the motor shaft, transmission input shaft and comminuting drive shaft is such that rotation of the transmission casing relative to the frame occasioned by a torque overload causes the distance between the motor shaft and the transmission input shaft to be increased, the consequent stretching of the drive belts providing a further resilient force resisting such rotation.
- Shredding machines of the general type with which the present invention is concerned are well known, see for example Schwarz U.S. Pat. No. 3,880,361, which is incorporated herein by reference. Machines of this type are frequently used for shredding trash, sheet metal, automobile tires, etc.
- a pair of parallel rotatable knife carrying shafts have sets of knives or cutters axially interleaved which are rotated in opposite directions to shred material which is gravitationally fed to the knives.
- the material being shredded may, in many instances, include pieces of metal or other objects which exert substantial resistance to the shredding action of the knives
- many of such machines are provided with a torque responsive control which will reverse the direction of rotation of the drive motor when a torque overload is sensed at the comminuting shafts. This reversal of direction of rotation of the comminuting shafts will disengage the teeth from the offending object and reposition the object by virtue of the reversal of the direction of rotation. Controls of this type are disclosed in the aforementioned patent.
- U.S. Pat. Nos. 1,409,238, 2,273,772, 2,597,635, 3,423,033, 3,478,972, 3,845,906 and 3,918,648, disclose various mechanisms which have attempted to solve similar problems but are not deemed suited to the purposes of the applicant here.
- the casing of a drive transmission component in the drive line is so mounted that a torque overload on the comminuting shafts reacts to bodily rotate this casing relative to the fixed frame of the machine.
- Cushioning devices are provided to resiliently resist this movement of the casing, thus cushioning the impact and absorbing the resistance applied to the knives for a period sufficient to enable the drive to be reversed before damage to the knives occurs.
- a drive motor and a hopper having a pair of counter-rotating knife carrying comminuting shafts located at the bottom of the hopper, are mounted in spaced relationship upon a fixed frame with the motor shaft disposed in parallel relationship to the two comminuting shafts.
- the two comminuting shafts are geared to a single drive shaft which projects from the hopper into the casing of a gear reduction box located between the drive motor and the hopper.
- a belt and pulley coupling couples the drive motor shaft to a second shaft which projects from the reduction gear housing at a location offset to one side of both the motor shaft and the comminuter input shaft.
- the casing of the gear reduction box is not directly attached to the fixed frame of the apparatus.
- An arm fixedly secured to the gear box casing projects from the casing and is formed with one or more openings through which elongate bolts fixedly secured to the machine frame freely project.
- Each such bolt carries a pair of opposed compression springs which engage opposite sides of the arm.
- FIG. 1 is a top plan view of a shredding apparatus embodying the present invention
- FIG. 2 is a side elevational view of the apparatus of FIG. 1;
- FIG. 3 is a detail cross sectional view taken on the line 3--3 of FIG. 1.
- an apparatus embodying the present invention is shown as including a fixed frame designated generally 10 having a drive motor 12 fixedly mounted on one end.
- a shredder of the type disclosed in U.S. Pat. No. 3,880,361 and designated generally 14, is fixedly mounted.
- Shredder 14 includes an open topped (and open bottomed) hopper 16 within which a pair of parallel comminuting shafts 18 are rotatably mounted and coupled to each other by gears 30a and 30b, so that the two shafts are constrained to rotate in opposite directions.
- Each shaft 18 carries a series of rotary knives 20, the knives of the respective shafts being axially interleaved with each other so that, as viewed in FIG.
- Drive motor 12 is employed to drive shafts 18 in rotation, the rotation of drive motor shaft 22 being transmitted to a reduction gear assembly or casing 24 via a belt and pulley coupling 26 which drives the input shaft 28 of reduction gear 24 in rotation.
- the output shaft 30 of reduction gear 24 is rotatively journaled in a housing 32 located at one end of hopper 14, rotation of shaft 30 being transmitted by gear, such as disclosed in U.S. Pat. No. 3,880,361, within housing 32 to shafts 18 in a well-known manner to achieve the desired counter-rotation of shafts 18.
- Reduction gear box 24 is not mounted directly upon frame 10, but instead is supported from the frame primarily by shaft 30. Casing 34 of gear box 24 would thus normally be free to rotate, relative to frame 10, freely about the axis of shaft 30. Casing 34 is restrained against such rotation by a cushioning spring assembly designated generally 36, and best shown in FIG. 3.
- a plate 38 is fixedly bolted to casing 34 to form an armlike projection from the casing.
- Fixed lugs 40 mounted on arm 38 are bored as at 42 to freely receive one or more bolts 44 which are fixedly located at one end upon frame 10.
- a pair of compression springs 46 are loosely received on each bolt 44, one spring 46 being engaged between the head 48 of the bolt and the upper surface of lug 40, while the second spring 46 is engaged between the lug 40 and a spacer 50 on frame 10.
- the gearing within gearbox 24 is such that, when the comminuting shafts 18 are being driven in their normal comminuting directions (the portions of knives 20 above shafts 18 moving toward each other), input shaft 28 of reduction gearbox 24 is driving in a clockwise direction as viewed in FIG. 3. It may be assumed that a gear on shaft 28 meshes with another gear within gearbox 24 at a point to the left of the axis of shaft 28 as viewed in FIG. 3. Thus, inasmuch as shaft 28 is journaled within casing 34 of gearbox 24, which is in turn supported upon shaft 30, a sudden force tending to slow or stop the normal rotation of shaft 30 reacts against the gear on shaft 28 in a manner tending to move shaft 28 downwardly as viewed in FIG. 3.
- shafts 22, 28 and 30 as viewed in FIG. 3 is such that the downward movement of shaft 28 described above acts to attempt to increase the distance between shafts 22 and 28, thus attempting to stretch the slightly stretchable hard rubber fabric belts of belt and pulley drive 26.
- Both of shafts 22 and 30 rotate about fixed axes relative to the machine frame, while the axis of shaft 28 is floating. Under normal belt tension, the radial distance A between shafts 22 and 28 is as indicated, thus shaft 28 would tend to move along an arc a centered on shaft 22.
- shaft 30 fixed with respect to the machine frame
- shafts 22 and 28 The location of shaft 30 (fixed with respect to the machine frame) to shafts 22 and 28 is such that movement of shaft 28 relative to shaft 30 must take place along the arc b which is located at a fixed radial distance B from shaft 30, radius B being fixed in that both shafts 30 and 28 are journaled within casing 34.
- shaft 28 moves downwardly, it is constrained to move along arc b and such downward movement must increase the distance between shafts 22 and 28 because of the divergence of the arcs a and b as indicated at c in FIG. 3.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
Description
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/179,068 US4346850A (en) | 1980-08-18 | 1980-08-18 | Shredding machine incorporating a torque cushioning assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/179,068 US4346850A (en) | 1980-08-18 | 1980-08-18 | Shredding machine incorporating a torque cushioning assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US4346850A true US4346850A (en) | 1982-08-31 |
Family
ID=22655108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/179,068 Expired - Lifetime US4346850A (en) | 1980-08-18 | 1980-08-18 | Shredding machine incorporating a torque cushioning assembly |
Country Status (1)
Country | Link |
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US (1) | US4346850A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4619409A (en) * | 1984-10-09 | 1986-10-28 | Medical Safetec, Inc. | Hospital waste disposal system |
US5620101A (en) * | 1994-12-06 | 1997-04-15 | Andela Tool And Machine, Inc. | Trommel separator clutch mechanism and system |
FR2832939A1 (en) * | 2001-12-05 | 2003-06-06 | Cff Recycling | IMPROVED OBJECT GRINDING SYSTEM |
ES2245550A1 (en) * | 2003-04-03 | 2006-01-01 | Isidro Sabater Belenguer | Crushing machine for wood remnants and other products, has opposing crushing rollers opposite each other, pneumatic suspension system with center body to counteract crushing rollers, and power transmission unit for driving crushing rollers |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1409238A (en) * | 1921-02-23 | 1922-03-14 | Punteney Archibald | Grinding mill |
US2244996A (en) * | 1939-10-24 | 1941-06-10 | John D Laird | Automatic release for feed grinders |
US3880361A (en) * | 1970-10-22 | 1975-04-29 | Tech Entwicklungs Buro Ltd | Apparatus for comminuting trash |
-
1980
- 1980-08-18 US US06/179,068 patent/US4346850A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1409238A (en) * | 1921-02-23 | 1922-03-14 | Punteney Archibald | Grinding mill |
US2244996A (en) * | 1939-10-24 | 1941-06-10 | John D Laird | Automatic release for feed grinders |
US3880361A (en) * | 1970-10-22 | 1975-04-29 | Tech Entwicklungs Buro Ltd | Apparatus for comminuting trash |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4619409A (en) * | 1984-10-09 | 1986-10-28 | Medical Safetec, Inc. | Hospital waste disposal system |
US5620101A (en) * | 1994-12-06 | 1997-04-15 | Andela Tool And Machine, Inc. | Trommel separator clutch mechanism and system |
FR2832939A1 (en) * | 2001-12-05 | 2003-06-06 | Cff Recycling | IMPROVED OBJECT GRINDING SYSTEM |
EP1319438A1 (en) * | 2001-12-05 | 2003-06-18 | CFF Recycling | Improved plant for pre-crushing objects |
US6836089B2 (en) | 2001-12-05 | 2004-12-28 | Cff Recycling | Installation for preliminary crushing of articles |
ES2245550A1 (en) * | 2003-04-03 | 2006-01-01 | Isidro Sabater Belenguer | Crushing machine for wood remnants and other products, has opposing crushing rollers opposite each other, pneumatic suspension system with center body to counteract crushing rollers, and power transmission unit for driving crushing rollers |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC., 270 Free format text: SECURITY INTEREST;ASSIGNOR:INDUSTRIAL GENERAL CORPORATION;REEL/FRAME:004864/0880 Effective date: 19880211 Owner name: HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC.,ILLI Free format text: SECURITY INTEREST;ASSIGNOR:INDUSTRIAL GENERAL CORPORATION;REEL/FRAME:004864/0880 Effective date: 19880211 |
|
AS | Assignment |
Owner name: FMP/RAUMA COMPANY, ALABAMA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MITTS & MERRILL, INC., A CORP. OF MICHIGAN;REEL/FRAME:005511/0259 Effective date: 19901029 |
|
AS | Assignment |
Owner name: HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC., ILL Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:INDUSTRIAL GENERAL CORPORATION;REEL/FRAME:005511/0839 Effective date: 19901029 |
|
AS | Assignment |
Owner name: RAUMA MACHINERY, INC., GEORGIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FMP - RAUMA COMPANY;REEL/FRAME:007124/0026 Effective date: 19940630 |
|
AS | Assignment |
Owner name: FMP - RAUMA COMPANY, GEORGIA Free format text: CHANGE OF NAME;ASSIGNOR:RAUMA MACHINERY, INC.;REEL/FRAME:007125/0985 Effective date: 19940630 |